Tailstock



R. HILL.

TAILSTOCK.

APPLICATION FILED SEPT. 1. 1920.

Patented Oct. 24, 1922.

Patented Oct. 24, 1922.

REUBEN HILL, HARTFORD, CONNECTICUT, ASSIGNOR TO PRATT & WHITNEY COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

TAILSTOCK.

Application filed September 1, 1920. Serial No. 407,397.

T 0 all whom it may concern Be it known that I, REUBEN HILL, a citizen of the United States, residing at Hartford, in the county of Hartford and State of (lonnecticut have invented certain new and useful Improvements in 'lailstocks, of which the following is a specification.

This invention relates to tailstocks and the primary object of the invention is the provision of an improved tailstock of simple design and one capable of easy and effective operation. A further object of the invention is to provide an improved tailstock adapted to be operated by a single handle to slide the work-engaging spindle and center from work-engaging position and to securely lock the same against sliding movement, movement of the handle in one direction being adapted to perform the spindlesliding operation and movement of the handle in another direction being adapted to lock the spindle. The construction is also preferably such that the work-engaging center is automatically engaged with the work with a limited predetermined pressure the handle being operative to slide the spindle in a work-engaging direction only. Other and more specific objects of the invention will appear as the description proceeds.

Referring to the figures of the drawing: Figure 1 is a side elevation of a tailstock embodying the present invention. Fig. 2 is an end view thereof. Fig. 3 is a rear end View of the spindlesupporting bearing.

Fig. 4 is a detail view of the operating handle.

Fig. 5 is a cross sectional view of the spindle and bearing taken on line 55 of Fig. 1.

In accordance with the present invention the operator, after clamping the tailstock in place on the lathe bed, may by the operation of a single handle control the engagement of the center with the work and lock the center in any position either in or out of engagement with the work. I preferably provide a spring of a predetermined strength for normally holding the center in its work-engaging position. The structure shown in the drawing illustrates the present invention, it being understood, however, that this construction may be varied within the scope of. the invention as defined in the 5 appended claims.

handle.

Referring to the drawing by reference (:haracters. 1 illustrates the lathe bed on the ways 2 of which the tailstock 3 is slidably mounted. The clamping mechanism for securing the tailstock to the l)(l preferably comprises a clamping piece 4 supported by a bolt 5 on a rotary locking bolt 6. Rotation of the bolt 6 by means of the handle 7 is adapted to raise and lower the bolt 5 and clamping piece 4 into and out of engagement with the ways by means of a cam 8 on the bolt 6. A dowel pin 9 prevents the rotation of the clamping piece. This construction within itself comprises no part of the present invention and may be of any form desired.

The tailstock spindle 10 is slidably mounted in the frame 3 and is adapted to support therein a work-engaging center 11. A stud 12 mounted rigidly in the spindle 10 ex tends through a slot 13 in the frame and means on this stud serves to operate the spindle. The stud 12 preferably has a head 12 forming an annular shoulder 12 abutting against the spindle. vents rotation of the stud. The operating means preferably comprises a handle 1 f provided with a hub 15 seated in an arcuate socket 16 in a toothed pinion or sector 17 rotatably mounted on the stud 12. Check nuts 18 hold the handle hub in position between the socket 16 and a socket cap 19. The teeth 20 of the sector 17 engage the teeth of a rack 21 slidably mounted in the frame 8. A guide 22 is provided for the rack and a pin 23 extending into a groove 2+1 in the rack limits the sliding movement of the rack. A pin 25 on the frame 3 is adapted to be engaged by a shoulder 26 on the sector 17 to prevent the idle forward movement of the As will be noted, the opening 27 in the handle hub 15 (Fig. 4) through which the stud 12 passes permits a limited movement of the handle in a direction at right angles to the spindle-sliding movement. Also as shown in Fig. 4., the axis :0 of the hub is greater than the axis a). A spring 28 normally keeps the spindle and center in work-engaging position.

The operation of the spindle is as follows: In the position illustrated in Fig. 1 and in full lines in Fig. 2, the center is held in engagement with the work V by means of the spring 28. To lock the spindle in position, the operator pulls the handle outward to the A screw 12 pre-l position illustrated in dotted lines in Fig. 2 whereupon the greater diametered portion .1: of the hub 15 enters between the sockets 16 and 19 and through the stud l2 draws the spindle l0 tightly against its bearing wall. IV hen it is desired to release the work, the handle is pushed to the full line position (Fig. 2) and then by a movement of the handle in the direction indicated by the arrow (Fig. l), the spindle and center are drawn from engagement with the work against the action of the spring 28. It will be noted that when the spring 28 has moved the center into engagement with the work, further movement of the handle will slide the rack 21 backwardly and therefore will not operate to force the center into tighter engagement with the Work.

An opening 29 is provided in the closure plate 30 to receive a knock-out rod for removing the center 11. I have also illustrated the ta-ilstock as provided with the usual adjustable Work support 31.

What I claim is:

1. A lathe tailstock comprising in combination, a frame, a spindle longitudinally slidable in the frame, and a single operating means adapted by a movement in one direction to slide the spindle longitudinally and by a movement in another direction to effect a bindinv action against the spindle to prevent sliding movement thereof.

2. A lathe tailstock comprising in combination, a frame, a spindle longitudinally slidable in the frame, an operating handle connected to the spindle and adapted by a movement in one direction to slide the spindle longitudinally, and means in operative relation to the handle and spindle and adapted by a movement of the handle in another direction to effect a binding action against the spindle to prevent sliding movement thereof.

3. A lathe tailstock comprising in combination, a frame, a spindle longitudinally slidable in the frame, an operating handle provided with a hub connected to the spindle, the handle being adapted by a movement in one direction to slide the spindle longitudinally, and wedging means on the hub of the handle adapted by a movement of the handle in another direction to lock the spindle against sliding movement.

4. A lathe tailstock comprising in comsignature.

bination, a frame, a center supporting spindle longitudinally slidable in the frame, a spring normally moving the spindle and center into a work-engaging position, an operat ing handle operatively connected to the spindle and adapted by a movement in one direction to slide the spindle longitudinally away from the Work and against the act-ion of the spring, and wedging means in operative relation to the handle and adapted by a movement of the handle in another direction to bind the spindle against sliding movement.

5. A lathe tailstock comprising in combination, a frame, a center supporting spindle longitudinally slidable in the frame, a spring normally moving the spindle and center into a Work-engaging position, an operatin handle operatively connected to the spindle and adapted by a movement in one direction to slide the spindle longitudinally away from the Work and against the action of the spring, the handle bem operative to move the spindle in a wor -disengaging direction only, and means in operative relation to the handle and adapted by a movement of the handle in another direction to lock the spindle against sliding movement.

6. A lathe tailstock comprising in combination, a frame, a center supporting spindle longitudinally slidable in the frame, a stud rigidly engaging and extending laterally from the spindle, a handle engaging the stud and adapted by a movement in one direction to slide the spindle longitudinally and by a movement in another direct-ion to lock the spindle against sliding movement.

7. A lathe tailstock comprising in combination, a frame, a center supporting spindle longitudinally slidable in the frame, a stud rigidly engaging and extendin laterally from the spindle, a handle engaging the stud, supplementalmeans comprising a rack and pinion operative by a rocking movement of the handle about the axis of the stud to slide the spindle longitudinally, and other supplemental means adapted by a movement of the handle in another direction to lock the spindle against sliding movement.

In, testimony whereof, I hereto aflix my REUBEN HILL. 

